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Picking the Best

The ETF business is booming -- so much so investors are inundated with options. Barron's experts share their tips for evaluating the field.

Choice is good, but when it comes to investing, it is possible to have too much of a good thing. The field of exchange-traded funds these days offers plenty of choice -- to the point that investors are faced with more than they need or even want. ETFs are no longer beholden to the realm of stock and bond indexes; they represent increasingly thin slices of the market, specific investing strategies, and, increasingly, esoteric asset classes, such as private equity or frontier-market stocks. ETFs are testing the boundaries of what's...